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Title: Investigation of bypass fluid flow in an active magnetic regenerative liquefier

Abstract

Active magnetic regenerators (AMR) with second order magnetocaloric materials operating below the Curie temperature have a unique property where the magnetized specific heat is lower than the demagnetized specific heat. The associated thermal mass imbalance allows a fraction of heat transfer fluid in the cold heat exchanger to bypass the magnetized regenerator. This cold bypassed fluid can precool a process stream as it returns to the hot side, thereby increasing the efficiency of liquefaction and reducing the cost of liquid cryogens. In the present work, the net cooling power of an active magnetic regenerative liquefier is investigated as a function of the bypass flow fraction. Experiments are performed at a fixed temperature span yielding a 30% improvement in net cooling power, affirming the potential of bypass flow in active magnetic regenerative liquefiers.

Authors:
; ORCiD logo; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1440612
Report Number(s):
PNNL-SA-135075
Journal ID: ISSN 0011-2275; HT0201000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cryogenics; Journal Volume: 93; Journal Issue: C
Country of Publication:
United States
Language:
English

Citation Formats

Holladay, Jamelyn, Teyber, Reed, Meinhardt, Kerry, Polikarpov, Evgueni, Thomsen, Edwin, Archipley, Corey, Cui, Jun, and Barclay, John. Investigation of bypass fluid flow in an active magnetic regenerative liquefier. United States: N. p., 2018. Web. doi:10.1016/j.cryogenics.2018.05.010.
Holladay, Jamelyn, Teyber, Reed, Meinhardt, Kerry, Polikarpov, Evgueni, Thomsen, Edwin, Archipley, Corey, Cui, Jun, & Barclay, John. Investigation of bypass fluid flow in an active magnetic regenerative liquefier. United States. doi:10.1016/j.cryogenics.2018.05.010.
Holladay, Jamelyn, Teyber, Reed, Meinhardt, Kerry, Polikarpov, Evgueni, Thomsen, Edwin, Archipley, Corey, Cui, Jun, and Barclay, John. Sun . "Investigation of bypass fluid flow in an active magnetic regenerative liquefier". United States. doi:10.1016/j.cryogenics.2018.05.010.
@article{osti_1440612,
title = {Investigation of bypass fluid flow in an active magnetic regenerative liquefier},
author = {Holladay, Jamelyn and Teyber, Reed and Meinhardt, Kerry and Polikarpov, Evgueni and Thomsen, Edwin and Archipley, Corey and Cui, Jun and Barclay, John},
abstractNote = {Active magnetic regenerators (AMR) with second order magnetocaloric materials operating below the Curie temperature have a unique property where the magnetized specific heat is lower than the demagnetized specific heat. The associated thermal mass imbalance allows a fraction of heat transfer fluid in the cold heat exchanger to bypass the magnetized regenerator. This cold bypassed fluid can precool a process stream as it returns to the hot side, thereby increasing the efficiency of liquefaction and reducing the cost of liquid cryogens. In the present work, the net cooling power of an active magnetic regenerative liquefier is investigated as a function of the bypass flow fraction. Experiments are performed at a fixed temperature span yielding a 30% improvement in net cooling power, affirming the potential of bypass flow in active magnetic regenerative liquefiers.},
doi = {10.1016/j.cryogenics.2018.05.010},
journal = {Cryogenics},
number = C,
volume = 93,
place = {United States},
year = {Sun Jul 01 00:00:00 EDT 2018},
month = {Sun Jul 01 00:00:00 EDT 2018}
}